Transforming a coal-fired power plant site into a low-carbon digital hub
The digital economy is expanding at unprecedented speed. Demand for artificial intelligence (AI) and other cutting-edge technologies is reshaping industries and driving a surge in global data centre development. Meeting this demand requires advanced infrastructure that is sustainable, resilient, and scalable.
TeraWulf is a leading digital asset mining and infrastructure company that establishes, operates, and maintains cutting-edge data centres in the US. The company sought Ramboll’s expertise to redevelop its Lake Mariner campus in Western New York, further establishing Ramboll’s reputation as a core delivery partner in the data centre sector.
This project includes TeraWulf’s latest addition at Lake Mariner, building CB-5 (160 MW), and brings the site’s total contracted capacity to over 360 MW. This growth is underpinned by Google’s $3.2 billion financial backstop and 14% equity stake, while Fluidstack serves as the primary AI/HPC tenant under a multi-year colocation agreement.
The site features dual 345 kV transmission lines and low-latency fibre. By repurposing existing transmission lines and industrial infrastructure at the former coal plant, the project eliminates the need for new greenfield development. The site operates on a low-carbon grid, primarily powered by nuclear and hydropower, with ongoing efforts to further integrate renewable energy sources. Advanced cooling technologies – including direct-liquid-cooled GPU servers and closed-loop glycol systems – are implemented throughout the campus to significantly reduce both energy and water consumption.
As a core delivery partner, Ramboll will guide efficient, environmentally responsible deployment and operation of these technologies and manage compliance within strict community standards, including noise limits and water stewardship.
One is good but two is better
TeraWulf is also planning a parallel expansion at the Cayuga site in Lansing, New York, USA, that adds an 80-year lease over approximately 183 acres, with up to 400 MW of capacity with approximately 138 MW of that targeted for service in the second half of 2026. This site also leverages substantial legacy infrastructure and a predominantly zero-carbon power mix. Ramboll will extend its end-to-end project delivery model to Cayuga.
As the construction phases accelerate, Ramboll teams will continue to work closely with TeraWulf to ensure critical 2026 delivery targets and help meet their sustainability goals such as incorporating onsite solar as a power source.